Compound for the prevention and removal of scale in steam-boilers



I GEORGE E. NORRIS,

of San Francisco,

Nrru STATES CHARLES GRYER AND GEORGE H. NORRIS, OF SAN FRANCISCO,CALIFORNIA.

COMPOUND FOR THE PREVENTION AND REMOVAL OF SCALE IN STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 268,461, dated December5, 1882.

Application filed June 23, 18852. (No specimens.) I

To all whom it may concern:

Be it known that we, CHARLES GRYER and of the cit-y and county State ofCalifornia, have invented an Improved (Jompound for Removal andPrevention of Scale in Steam-Boilers; and we hereby declare thefollowing to be a full, clear, and exact description thereof.

Our invention relates to a compound for the removal and prevention ofscale in steamboilers; and it consists in a preparation of preparedleather scraps with caustic or hydrate of soda, the leather scraps firstbeing-submitted to a preliminary treatment by which they are freed ofall such extraneous matter as grease and oil.

In February, 1875, a patent was issued to J. H. Pitts for a compound ofleather scraps, caustic soda, gelatine, and water, the leather beingfirst boiled in the soda until dissolved, and the gelatine dissolved inthe water and afterward added. We have found this compound almostentirely useless, because the soda liberates from the leather the oil,grease, &c., with which it has been originally dressed, and forms withit a saponaceous compound, which causes the water in a boiler to foam,so as to greatly interfere with or stop its proper action. v

Our invention contemplates the preliminary treatment of leather scrapswith naphtha, or

other volatile oil or substance, by which all the oil and grease isremoved from the leather, then drying it to remove all the volatile oil,and lastly, boiling the leather scraps in caustic soda until dissolved,and the addition of a sufficient quantity of Water.

In carrying out our invention, we take the required quantity ot'leatherscraps to make the proper proportion of the compound and steep them innaphtha, or other suitable hydrocarbon, or volatile oil orsubstancenvhich will thor-.

the liquid and spread in a suitable place to dry. After the leatherscraps are dry or freed from the volatile oil they are placed in asolution of caustic soda or hydrate of soda and boiled until dissolved.Various proportions of the substance named may be used; but we havefound that one pound of the prepared leather scraps to two ounces ofhydrate or caustic soda and one gallon of water will produce a compoundwhich gives very satislactory results.

In some cases tan-bark is treated by boiling with hydrate or causticsoda and the resulting liquid added to the compound; but this is notabsolutelynecessary, although for some purposes it improves thecompound.

Having thus described our invention, we do not claimbroadly a compoundformed by boiling together ordinary leather scraps, caustic soda.gelatine, and water; but

What we do claim as new, and desire to se cure by Letters Patent, is-

The process of making an incrus' ation-preventive,which consists infirst steeping leather or leather scraps in naphtha or other hydrocarbonor volatile oil to remove grease or oil, then boiling the leather scrapsthus prepared with hydrate or CktllSlJlG soda and water, substantiallyas and for the purpose described.

In witness whereof We hereunto set our hands.

CHARLES ORYER. GEO. H. NORRIS. NVitnesses:

THos. H. HOLT, WILLIAM L. Hmcuvs.

